Electric pull-socket switch.



v w. PFEIPER, JR. ELECTRIC PULL SOCKET SWITCH.

APPLICATION FILED 3111.22, 1912.

Patented Aug. 20, 1912.

WILLIAM PFEIFER, .13., or JERSEY CITY, NEW JERSEY;

- ELECTRIC PULL-SOCKET SWITCH.

Specification of Letters Patent.

Patented Ana. 20,1912.

- Application filed January 22,1912. Serial No. 672,695.

Toall whom it may concern Pie. it known that I, .ViLLLrM PFEIFER, J12, acltizen of the United States of America, and -a resident of Jersey City, county. of Hudson, State of New Jersey, have invented certain new and useful Improvements in Electric; Pull-Socket Switches, of which the following is a specification.

This invention has reference to a novel electric pull socket switch.

It, pertains particularly to a SWltCllOf a I type which is used for preventing the pullmg of incandescent lamps sidewise. Accordingly these switches are applied to lamps whlch are operated by a chain mechanism; The movableccntacts of the device struc't-ion the cost of production has been "kept relatively low,

In addition to this main object it has been sought to produce a neat and desirable articleall as will be fully described hereinafter withreference to the accompanying drawinmin which:

Figure 1 representsin vertical section an electric, pull socket switch embodying in derable form the present improvements. Fig} 2 is a side elevation of Fig. 1 partly broken away, on line 22 of Fig. 1. Fig. is a section on-line 3-3 of Fig. 1 and Fig. 4; isa section on line 44 of Fig. 1.

.Similar characters of reference denote like parts in all the figures.

Referring to the drawing P-P are supports ofporcelain or} other insulating mater'ial' .whic'lnare mounted in the. shell of the socket (not shown).

1+ -1-.repre sent the wires secured to the 'terniina'lsl '1 which connect said supports on the outside. A stationary ferticirl rod or screw 2 connects the insulating si ipports P-P centrally. Acontact-j screw 3; passes through the support P and connects with th'e' continuat'ion ot the terminal 1 shown to the left in Fig. 1. Opposite the contact screw 3 there is a screw 4. in said support. This screw 4 represents merely a mechanical securing means and no current passes through the same. f The stationary rod or screw 2 is partly threaded in its lower portion and a securing nut 5 is on said threaded portion, The central screw or rod 2 establishes contact with one wire in the lamp. As shown in Fig. 2 the terminal 1 shown to the right in Fig. 1', connects electrically with said rod.

The operative mechanism of the device comprises two movable contacts. These con-v tacts e o are secured to a square block or support S which is loosely mounted on the central screw 2. The contacts 6'-6 accordingly are movable with-said support 55 on the screw 2. It is evident however that the row 2 may be screwed up and down in the nut 5 without aifecting the support 55 and the contacts 6 secured thereto. On the central screw 2 and on top of the support S there is a square plate 7. This plate has ,two slanting shifting portions 8 on op'posit sides, arranged reversely to each othe and at a right angle to'sa'id Fig. 1.

On the top surface of the nut 5 there is a plate 9 preferably integral therewith. This plate 9 has slanting opposite side flanges reversely arranged which are permanently fixed like the nut. A lateral extension 9 on said plate 9 is adapted to establish connection with the contacts 6. In order to prevent the contact from being suddenly broken, the said extension 9 has a semicrescent lateral extension 9 on which the contacts 6 slide during the operation of the device and snap oii only when thepoint of said extension 9 has been passed. Opposite said extension 9 electric contact may be established with the contacts 6 by the horizontal portion 1 of the terminal 1 "A like semi-crescent extension 1 is formed on the terminal portion 1 for the purpose above stated. The stationary-a, slanting plate 9 presses the contacts into the right location during the operation of the switch.

It is plainly seen that the current passing through the terminal 1 and its horizontal portion l flows through one contact (lwhen same is thereon, the square conductive block or suppor-tXS, the second contact 6, the lateral extensi 9 of 'the plate 9, through same, and the \nut 5 into the lower portion 2 of the .screw, from there into the lamp.

plate as shown-1n The screw 2 is loosely within the conductive block S, therefore contact is not securely established between same and the lower screw the block S when said contacts are, one on portion 2, but contact is always securely establlshed by means of theicontacts 6 of 13. The chain has on its free end portion a ring 14; to which it is attached. When the ring is pushed downwardly along the tube the chain moves the plate 7 and establishes contact. As previously stated one contact 6 slides onto the extension 9 of the slanting plate 9 which is permanently secured to the nut 5 and located immediately below vthe square support S.'- Thus said square, support is gradually raised with the contacts thereon'and after same has made a quarter revolution the contacts 6 on the support S which also has been'raised will again descend with same after reaching the end of the extension 9 and the portion 1 of the second terminal. The spring 11 havingthe tendenc to press the mechanism on the screw 2 in a downward direction now acts and the contact is thus broken through second operation of the device. Upon the third operation of the device contact is again establ1shed and so on. In order to facilitate the movements of the square block S the alter-- nate lower corners of same are rounded ofi? as shown ,in Fig. 4, while two other corners are square to efi'ect the keeping of the block in a fixed position when said block has been moved one quarter of a circle.-

I claim as my invention:

1. An electric pull socket switch comprising two insulating supports, terminals connecting same on the outside, a lateral extension. on one or said terminals forming one stationary contact, a partially threaded screw connecting the supportscentrally, a

stationary nut on the lower insulating sup port with lateral extension forming a second contact, springprcssed rotatable means on sald screw to establish alternately electr1c connection. with the'stationary contacts, and

I ing two insulating supports, terminalsconnecting same on the outslde, a lateral extenmeans for actuating therotatable means for 90f at a time.

2. An electric pull socket'switch comprission on one of said terminals forming gone stationary contact, a partially threaded screw connecting the supports centrally,a stationary nut on the lower insulating support with lateral extension forming a second contact, a spring pressed square support on the screw with two oppositely rounded corners, a sliding contact'on each side of said support, and means for rotating same.

3. An electric pull socket swltch comprisnecting' same on the outside, a lateral exte'n s1on on one of said terminals forming ing two insulating sgpports, terminals con stationary contact, a partially. threadedscrew connecting the supports centraily, a g

stationary nut on the lower insulatingi su p-.

port with lateral extension formmga Secon 3,80 reversely arranged, a spring pressed square I support on the screw with two oppositely,v

contact, two slanting side flanges on said nut rounded corners, a sliding contact on each side of said support, and means for'rotating same. a

a 4:. An electric pull sockets itch comprising two insulating supports, terminals connecting same on the outside, a lateral extens1on on one of said terminals forming one stationary contact, a partially threaded screw connecting the supports centrally, a stationary nut on the lower insulating support with lateral extension forming a second contact, two slanting side flanges on said nut reversely arranged, a spring pressed square support on the screw with two oppositely rounded corners, a sliding contact on each side of said support, means for rotating same, a movable square plate on the square support, a chain in connection therewith, a

flexible tube for housing the chain, and a' ring connecting with the chain adapted to slide on the tube. v c

'5. In an electric pull socket switch Stationary contacts, a partially threaded screw withnut integrally connected with one contact, two'slanting side flanges thereon ,re-

\ersely arranged, a rotatable square support j on said screw having two oppositely rounded corners, two lateral contacts on sand support oppositely arranged, a square plate on the top portion of said support having t wo slanting side flanges oppositely arranged, a coiled spring above pressing the mechanism ntn'maliy 1 a downward direction, and means in connection with: said square plate for operating the device.;.

Signed at Xew York, N. Y., thisiOth, of January, 1912.

WILLIAM Prams,

"Witnesses:

EMMA A. Mociiuuc t, Mame H. BRAUN. 

